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2.4
Register Configuration
2.4.1
Overview
The CPU has the internal registers shown in figure 2-4. There are two types of registers: general
registers and control registers.
General Registers (Rn) and Extended Registers (En)
15
ER0
ER1
ER2
ER3
ER4
ER5
ER6
ER7 (SP)
Control Registers (CR)
Legend:
SP:
Stack pointer
PC:
Program counter
EXR:
Extended control register
T:
Trace bit
I2 to I0:
Interrupt mask bits
CCR:
Condition-code register
I:
Interrupt mask bit
UI:
User bit or interrupt mask bit*
Note: * In the H8S/2319 and H8S/2318 Groups, this bit cannot be used as an interrupt mask.
Rev. 5.00, 12/03, page 32 of 1088
07
E0
E1
E2
E3
E4
E5
E6
E7
23
H:
U:
N:
Z:
V:
C:
Figure 2-4 CPU Registers
07
R0H
R1H
R2H
R3H
R4H
R5H
R6H
R7H
PC
7 6 5 4 3 2 1 0
T I2 I1 I0
EXR
7 6 5 4 3 2 1 0
CCR
I UI H U N Z V C
Half-carry flag
User bit
Negative flag
Zero flag
Overflow flag
Carry flag
0
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
0
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